Congress has a lot of unfinished business to address...

1of3House Speaker Paul Ryan (R-Wisc.) and lawmakers will return from recess following the Labor Day holiday facing a stack of bills that must be addressed. "We've got to get it done," Ryan told a displeased voter in his home state.Photo: J. Scott Applewhite, STF

3of3FILE - In this April 6, 2017 file photo, Sen. Orrin Hatch, R-Utah speaks on Capitol Hill in Washington. Republicans have little to show for their first seven months of controlling the White House and Capitol Hill. The Senate sent Justice Neil Gorsuch to the Supreme Court, and Congress passed bills bolstering veteransÂ health programs and financing the Food and Drug Administration. (AP Photo/Cliff Owen, File)Photo: Cliff Owen, FRE

WASHINGTON - Congress will have to prove its mettle this fall. It has no choice.

Republicans have little to show for their first seven months of controlling the White House and Capitol Hill. The Senate sent Justice Neil Gorsuch to the Supreme Court, and Congress passed bills bolstering veterans' health programs and financing the Food and Drug Administration. It approved another sanctioning Russia for its 2016 election meddling, which President Donald Trump resentfully signed knowing Congress would lopsidedly override a veto.

Lawmakers returning from recess after Labor Day will confront a pile of bills they must approve. They'll also face another stack of work they've promised to tackle and that GOP voters elected them to achieve.

Republicans in charge …

... But have yet to prove they can deliver their promised agenda or accomplish the basics of governing.

Congressional leaders recognize this risks blowback in next year's midterm elections. House Speaker Paul Ryan, R-Wis., told a displeased voter in Mukwonago, Wisc., last week, "We've got to get it done."

September will give Republicans a chance to complete their responsibilities with minimal fuss. If they deliver a tax cut, GOP thinking goes, much will be forgiven.

Money

Two must-do items will dominate Congress' September agenda: increasing the government's debt limit to prevent a jarring federal default and passing a temporary spending bill to avert a government shutdown.

Many Republicans can't bring themselves to back a debt limit boost. But they run the government, and it's their responsibility to deliver those votes. Democratic support will be required, and some hope they'll win concessions in exchange.

A stopgap measure will be needed because the 12 annual spending bills are behind schedule. There's no agreement on their overall price tag, which will be in the $1 trillion-plus range.

One wild card is whether Trump will press to fund the U.S.-Mexico border wall he's pledged. That could spark a nasty confrontation with Democrats.

Taxes

The White House and Republicans promise to revamp the loophole-choked tax code and lower rates for corporations and individuals. Along with repealing and replacing President Barack Obama's health care law, this is holy grail for the GOP.

But core principles remain unresolved, including whether the effort would further bloat the budget deficit. Crucial details must be settled, among them how far to lower rates and which tax credits and deductions would be erased. The last time those problems were reconciled and the tax code broadly reshaped was 1986.

Health care

The GOP's signature disaster so far this year was the Senate's July rejection of attempts by Majority Leader Mitch McConnell, R-Ky., to eradicate Obama's health care law. Republican divisions proved fatal, and they're split over what comes next.

Trump has goaded McConnell to keep trying. Senate leaders have shown little enthusiasm for charging back up that hill without the votes to pass something.

Health committee Chairman Lamar Alexander, R-Tenn., says he'll work with the panel's top Democrat, Patty Murray of Washington state, to continue billions in payments to insurers for reducing out-of-pocket costs for low- and middle-income customers. In exchange, Alexander wants to relax coverage requirements that protect consumers under Obama's law. It's unclear the parties can reach a compromise.

Defense

The Senate aims to approve the annual defense policy bill in September. That's when Senate Armed Services Committee Chairman John McCain, R-Ariz., expects to return to Washington after starting brain cancer treatment. He and McConnell wanted to pass the bill last month, but Sen. Rand Paul, R-Ky., thwarted that plan. Paul wants votes on amendments on indefinite detention and war authorization.

Russia

The House and Senate intelligence committees are investigating whether Russia worked with Trump's presidential campaign to try helping him win the election. The FBI and Justice Department special counsel Robert Mueller are also investigating.

Trump has repeatedly denigrated the issue as "fake news" and a "witch hunt."